Abstract: A liquid discharge recording head, comprising a plurality of orifice strings each having a plurality of orifices arranged correspondingly to respective recording liquids for discharging the recording liquids of a plurality of colors, a plurality of liquid flow paths and electrical heat converting elements corresponding to the plurality of orifices, and a plurality of liquid supplying apertures arranged along the orifice strings for supplying the recording liquids of the plurality of colors to the plurality of liquid flow paths, wherein the orifice strings corresponding to the recording liquids of the plurality of colors are symmetrically arranged about the head scanning direction regarding the same color of the recording liquids and the head has a plurality of chambers having communication with the liquid flow paths in the opposite side of the orifice strings with the liquid supplying apertures therebetween.

Abstract: To reduce a quantity of uselessly consumed ink when an ink jet head is recoverably activated, the capacity of an ink path communicated with a group of ejecting ports having a small flow rate coefficient is determined to be smaller than that of an ink path communicated with a group of ejecting ports having a large flow rate coefficient. While all of plural groups of, ejecting ports are fully covered with a common recovering cap with the aid of sucking means, ink is, sucked from the plural groups of ejecting ports. When the ink remaining in the region extending from the plural groups of ejecting ports to predetermined positions in a plurality of ink paths communicated with the plural groups of ejecting ports is discharged, ink discharging positions are dislocated to predetermined positions in a plurality of ink paths to positionally coincide with the predetermined positions in the substantially same timing relationship after ejection recovering treatment starts to be conducted.

Abstract: A head is provided with a driving signal line having a driving terminal for receiving a driving signal sent from an apparatus to the head, and an identification terminal. The driving signal line is electrically connected to the identification terminal. With the use of the driving signal line and the identification terminal, the head is identified.

Abstract: An ink jet recording head includes a plurality of recording element substrates each having a plurality of recording elements for applying ejection energy to recording liquid; a plurality of flow paths for the recording liquid which is to receive ejection energy; a supply port for supplying the recording liquid to the plurality of flow paths; a plurality of ejection outlets for ejecting the recording liquid, the ejection outlets being disposed face to the recording elements, respectively; wherein distances between the recording elements and the ejection outlets in at least one of the recording element substrates are different from distances between the recording elements and ejection outlets of another one of the recording element substrates, and wherein liquid ejection systems of the recording elements of the at least one of the recording element substrates and the recording elements of the another one of the recording element substrates, are different.

Abstract: The invention provides an ink jet recording head in which a discharge port forming member including plural discharge ports for discharging droplets of recording liquid is provided on a substrate bearing thereon plural recording elements for providing the recording liquid with discharge energy and electrical circuit elements for driving the recording elements, the head comprising a first metal film covering the upper side of the recording elements and a second metal film covering the upper side of the electrical circuit elements; wherein the discharge ports are so arranged as to form plural arrays and the recording elements are so arranged as to form an array in the vicinity of each array of the discharge ports; the first metal film is provided over the plural arrays of the recording elements; and the first and second metal films are formed in the form of a mutually opposed pair of comb teeth.

Abstract: A head is provided with a driving signal line having a driving terminal for receiving a driving signal sent from an apparatus to the head, and an identification terminal. The driving signal line is electrically connected to the identification terminal. With the use of the driving signal line and the identification terminal, the head is identified.

Abstract: A method for producing an ink jet recording head having a plurality of recording element substrates each including a recording element for generating energy to be used for ink discharge and an electrode portion connected to the recording element, a wiring substrate provided with an electrode terminal to be electrically connected with the electrode portion of the plural recording element substrates and adapted to transmit an electrical pulse for ink discharge to the recording element, and an element substrate support member for supporting the plural recording element substrates, comprises a step of causing the plural recording element substrates to be supported on the element substrate support member, and a step of thereafter executing metal-metal bonding between the electrode portion of the plural recording element substrates and the electrode terminal of the wiring substrate.

Abstract: An ink jet printing head for effecting printing by ejection of ink includes a first electrothermal transducer having a heat generating resistor with a first area and wiring electrically connected with the heat generating resistor; a second electrothermal transducer having a second heat generating resistor with an area which is different from the area of the first heat generating resistor; wherein bubbles are produced in ink materials upon application of electric signals to the electrothermal transducers, by which different volumes of ink materials are ejected; wherein the first and second electrothermal transducers have substantially the same bubble production threshold voltage.

Abstract: The invention provides an ink jet recording head in which a discharge port forming member including plural discharge ports for discharging droplets of recording liquid is provided on a substrate bearing thereon plural recording elements for providing the recording liquid with discharge energy and electrical circuit elements for driving the recording elements, the head comprising a first metal film covering the upper side of the recording elements and a second metal film covering the upper side of the electrical circuit elements; wherein the discharge ports are so arranged as to form plural arrays and the recording elements are so arranged as to form an array in the vicinity of each array of the discharge ports; the first metal film is provided over the plural arrays of the recording elements; and the first and second metal films are formed in the form of a mutually opposed pair of comb teeth.

Abstract: An ink jet recording head that is capable of avoiding damages due to cavitation of an electrothermal converting element and thus extending its life is provided. The ink jet recording head comprises a plurality of ink discharge ports for discharging ink; a plurality of electrothermal converting elements provided to be associated with each of the ink discharge ports, respectively, for bubbling and discharging the ink; a plurality of pressure chambers for containing the electrothermal converting elements and providing spaces for heating and bubbling the ink; a common liquid chamber for supplying ink to the plurality of pressure chambers; and a plurality of ink flow paths for communicating the pressure chambers with the common liquid chamber. The ink flow paths are arranged such that central lines in a direction of ink supply to the pressure chambers are positioned offset from central lines of the electrothermal converting elements in the same direction.

Abstract: A liquid ejection method includes a step of preparing a liquid ejection head including an electrothermal transducer element for generating thermal energy contributable to ejection of liquid, an ejection outlet for ejecting liquid, the ejection outlet being provided at a position opposed to the electrothermal transducer element, a liquid flow path in fluid communication with the ejection outlet to supply the liquid to the ejection outlet and having the electrothermal transducer element on its bottom side; a step of applying the thermal energy to the liquid to cause state change to the liquid to create a bubble, wherein the liquid is ejected through the ejection outlet by a pressure of the bubble; wherein the bubble is first in communication with the ambience in a process of reduction of the volume of the bubble after the bubble reaches a maximum volume.

Abstract: A liquid ejection recording head includes a plurality of arrays of ejection outlets for ejecting the same liquid; common chambers, provided for respective arrays of the ejection outlets, for supplying the liquid to the arrays of the ejection outlets, respectively; a liquid inlet for receiving the liquid from an outside of the liquid recording head; a common passage in fluid communication with the liquid inlet; branched passages branched from the common passage and in fluid communication with the common chambers, respectively, wherein the branched passages have liquid supply properties which are equivalent to each other.

Abstract: An ink jet recording head includes a plurality of recording element substrates each having a plurality of recording elements for applying ejection energy to recording liquid; a plurality of flow paths for the recording liquid which is to receive ejection energy; a supply port for supplying the recording liquid to the plurality of flow paths; a plurality of ejection outlets for ejecting the recording liquid, the ejection outlets being disposed face to the recording elements, respectively; wherein distances between the recording elements and the ejection outlets in at least one of the recording element substrates are different from distances between the recording elements and ejection outlets of another one of the recording element substrates, and wherein liquid ejection systems of the recording elements of the at least one of the recording element substrates and the recording elements of tho another one of the recording element substrates, are different.

Abstract: With an ink-jet recording head comprising multiple nozzle rows, for discharging ink of different colors, arrayed in approximately a straight line in approximately the same direction as the transporting direction of a recording medium, the positioning spacing of the nozzle rows of each of the colors is set so as to be greater than the length of the nozzle rows for discharging ink of each of the colors. This prevents bleeding on the recording medium and mixing of colors on the recording head in cases of printing at high speeds with in-line type recording heads, in an arrangement with simple modifications.

Abstract: A liquid ejection method includes a step of preparing a liquid ejection head including an electrothermal transducer element for generating thermal energy contributable to ejection of liquid, an ejection outlet for ejecting the liquid, the ejection outlet being provided at a position opposed to the electrothermal transducer element, and a liquid flow path in fluid communication with the ejection outlet to supply the liquid to the ejection outlet and having the electrothermal transducer element on its bottom side; and a step of applying the thermal energy to the liquid to cause the liquid to undergo a change of state and thus to create a bubble. The liquid is ejected through the ejection outlet by the pressure of the bubble. The bubble is first in communication with ambience during reduction of the volume of the bubble after the bubble reaches a maximum volume.

Abstract: A liquid discharge recording head, comprising a plurality of orifice strings each having a plurality of orifices arranged correspondingly to respective recording liquids for discharging the recording liquids of a plurality of colors, a plurality of liquid flow paths and electrical heat converting elements corresponding to the plurality of orifices, and a plurality of liquid supplying apertures arranged along the orifice strings for supplying the recording liquids of the plurality of colors to the plurality of liquid flow paths, wherein the orifice strings corresponding to the recording liquids of the plurality of colors are symmetrically arranged about the head scanning direction regarding the same color of the recording liquids and the head has a plurality of chambers having communication with the liquid flow paths in the opposite side of the orifice strings with the liquid supplying apertures therebetween.

Abstract: A liquid ejection recording head for effecting recording by ejecting first liquid and second liquid which is a different kind of liquid through different ejection outlets, while bidirectionally scanning a recording material in a scanning direction includes a group of first ejection outlet arrays each of which has a plurality of ejection outlets at predetermined intervals arranged in a direction different from the scanning direction, wherein corresponding ejection outlets in the respective ejection arrays are aligned in the scanning direction; a group, disposed adjacent the group of the first ejection outlet arrays, of second ejection outlet arrays arranged in a manner similar to the first ejection outlet array group; wherein the first ejection outlet arrays include a first ejection outlet array for ejecting the first liquid and a second ejection outlet array for ejecting the second liquid; wherein the second ejection outlet arrays include a third ejection outlet array for ejecting the first liquid and a fourt

Abstract: An ink jet head is provided with an orifice plate having a plurality of discharge ports being open thereto. This ink jet head comprises evaporation suppressing groove in the vicinity of the discharge ports. With the arrangement thus formed, it becomes possible to heighten the humidity in the atmosphere in the vicinity of discharge ports, hence suppressing the evaporation from the discharge ports for the prevention of unstable discharges.

Abstract: An ink jet head comprises a plurality of discharge pressure generating elements serving as the discharge pressure source for discharging an ink droplet, an orifice plate having a plurality of ink discharge ports corresponding to the respective discharge pressure generating elements formed therefor, an ink supply port for supplying ink and a nozzle wall forming an ink flow path communicating the ink discharge ports with the ink supply port. The orifice plate and the nozzle wall are formed by resin material, and also, a thin metallic film is formed on the outer surface of the orifice plate. If desired, a water-repellent film is formed further on the surface of the thin metallic film. With the metallic film formed on the surface of the orifice plate, the moisture in ink is effectively prevented from being evaporated. Further, with the provision of the metallic film, it becomes possible to perform the eutectoid plating for the formation of the water-repellent film.

Abstract: Each of branched ink supply passages 42ai to 42an and 42bi to 42bn in a driving substrates 32 is constituted of a parallel passage portion 46a and a narrow passage portion 48a. An ink from an ink supply opening 32a is supplied to a receptacle portions 50 respectively receiving heater portions 32ai to 32an and 32bi to 32bn via the branched ink supply passages 42ai to 42an and 42bi to 42bn.